10.Researchers wanted to determine if carpeted rooms contained more bacteria than uncarpeted rooms. To determine the number ofbacteria in a room, researchers pumped the air from the room over a Petri dish at the rate of 1 cubic foot per minute for eightcarpeted rooms and eight uncarpeted rooms. Colonies of bacteria were allowed to form in the 16 Petri dishes. The results shownbelow are bacteria counts per cubic foot.Carpeted roomUncarpeted roomMeanStandarddeviationSample size11.2 2.67749.7875 3.2188Test using a significance level of 0.01 whether the mean bacteria count is higher for carpeted rooms than for uncarpeted rooms.Show all steps using the critical value method. The value of the test statistic is t=0.955 and the p-value is 0.1778. Show your nulland alternative hypothesis and state your conclusion.

To test whether the mean bacteria count is higher for carpeted rooms than for uncarpeted rooms using…

Answered: 10.Researchers wanted to determine if…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A researcher reports an F-ratio with df= 3,27 for an indenpendant measure research study. a. How many treatment conditions were compared in the study? b.How many subjects participated in the entire study?
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You have been hired to measure the concentration of ammonia in water from wells at two districts on Long Island. After sampling 10 wells in one of the districts you find the values are, in mg/L: 6.4, 2.1, 1.4, 0.7, 6.8, 3.2, 2.7, 1.6, 4.9, 1.2. Your assistant plots the data from the second set of wells and the histogram of data from that sample looks pretty much the same as for your data set. Which statistical test do you anticipate that you will use? An one-sample t-test An unpaired, two-sample t-test A paired, two-sample t-test A one-way anova A Mann-Whitney U test Main Content
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Three products were used in a hot summer to keep the pool chlorine level high. Each product was used in 6 pools, and there was a total of 18 pools in the experiment. The same amount of chlorine was added to each pool (A, B, or C) and the conditions such as pool size, temperature, sun exposure etc. were similar. The chlorine levels (%) were measured and recorded after 24 hours of using the products. The percentages in the table below are the percentage of the chlorine added to the pool remaining after this 24 hours. The data is as follows: A 96 56 52 66 70 60 B 44 36 34 50 40 48 с 723227 34 40 20 24 a) Find the overall mean of the chlorine level across all the pools measured, and then find the mean of the chlorine level for each product.
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In the table below is a column of masses for various individuals. 20 Kg (kllograms), for instance, is a typical mass for a young child while 80 kg Is characteristic of an adult's mass, If you were to travel to the Moon, your weight would change but your mass would remain the same. Roughly speaking, mass is a measure of the amount of "stuff" you're made of (matter). In the United States we commonly measure weight using the English pound. Another common unit for measuring weight is the Newton. The second column in the table shows the corresponding weight, in Newtons, for each individual. These are the weights on Earth. Plot each pair of numbers as an ordered pair on the graph. Use the vertical ("y") axis for the weights and the horizontal ("x") axis for mass. Label your axes. Draw a best fit line through the points and measure the slope of this line. On your plot, mark and circle the points you use to determine the slope. The slope gives you the "weight per unit mass" here on Earth. In…
researchers wanted to determine if carpeted rooms contained more baterica than uncapted rooms. to determine the amount of bacterica in a room reseachers pumpled the air from the room over a petri dish at the rate of 1 cubic foot per minute for eight carpeted rooms and eight uncaprted rooms. colonies of baterica were alled to form in 16 petri dishes. the results shown below are the baterica counta per cubic foot mean standard deviation sample size capeted room 11.2 2.6774 8 uncapted room 9.7875 3.21 8 you want ti test using sigificance level of 0.01 whether the mean bactiria count is high for carpeted rooms than for uncapteed rooms. test whether the mean bacteria count is high for carpeted rooms thatn uncarpeted rooms. show all steps using the p value method. what is Ho and H1? what is the test statsic and p value? what conclusion can be made?
Periodically, the county Water Department tests the drinking water of homeowners for contaminants such as lead and copper. The lead and copper levels in water specimens collected in 1998 for a sample of 10 residents of a subdevelopement of the county are shown below. lead (μμg/L) copper (mg/L) 4.4 0.643 2.4 0.57 1.5 0.46 2.6 0.895 5.9 0.2 3.4 0.54 3.8 0.245 1.6 0.583 5.7 0.769 1.7 0.215 (a) Construct a 9999% confidence interval for the mean lead level in water specimans of the subdevelopment. ≤μ≤
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The chlorine added to swimming pools to combat relatively short shelf before it loses its effectiveness. Records indicate that the mean shelf life of a 5 gallon jug of chlorine is 2,160 hours (90 days). As an experiment, Holdlonger was added to the chlorine to whether it would increase the shelf life of the chlorine. A sample of nine jugs of chlorine had these shelve lives (in hours): 2,159, 2, 170, 2,180, 2,179, 2,160, 2,167, 2,171, 2,181 and 2,185. At the .025 significance level, has Holdlonger increased the shelf life of the chlorine? S=9.3823, sample mean=2172.44 STATE THE NULL AND ALTERNATE HYPOTHESIS. Determine the critical value for the decision rule.

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